ISIS execution squads have appeared on the streets of Fallujah, with orders to kill anybody trying to flee or surrender as Iraqi government forces advancing in the Terrorist Stronghold.

As Iraqi Allied forces advancing toward Fallujah, 3 ISIL gunmen were killed inside Fallujah by locals, which would be a first sign of armed resistance to ISIL by local people.

"Groups of ISIL Terrorist are saying they will kill anybody in Fallujah who leaves their house or waves a white flag," says Ahmed al-Dulaimi, a political activist who spoke by phone to relatives and friends in the city."

"No one can leave. It's dangerous. There are snipers everywhere along the exit routes," one resident said, Independent reports.

UN refugee agency UNHCR said women and children died while trying to leave, but more than 80 families have managed to escape since May 20.

In other hand Iraqi Shia Fighters manage 3 corridor for people of Fallujah to Flee and help them to exit the city.

Humanitarian assistance like food and medicine are provided for people who cross the corridors and reach safe place shelters under Shia fighters protection, video show.

About 100,000 civilians are estimated to be in Fallujah which, in January 2014, became the first Iraqi city to be captured by Islamic State, six months before the group declared its caliphate.The population was three times bigger before the war.

The loss by ISIL of Fallujah, a Sunni commercial hub on the main road to Jordan, would be a serious blow to terrorist group.

Its capture of the city, so close to Baghdad, at the beginning of 2014 was the extremist Sunni movement's first spectacular military victory.